Environmental and epigenetic regulation of Rider retrotransposons in tomato

Research output: Contribution to journalArticle

Authors

  • Matthias Benoit
  • Hajk-Georg Drost
  • Quentin Gouil
  • Sara Lopez-Gomollon
  • David Baulcombe
  • Jerzy Paszkowski

Colleges, School and Institutes

External organisations

  • University of Cambridge

Abstract

Transposable elements in crop plants are the powerful drivers of phenotypic variation that has been selected during domestication and breeding programs. In tomato, transpositions of the LTR (long terminal repeat) retrotransposon family Rider have contributed to various phenotypes of agronomical interest, such as fruit shape and colour. However, the mechanisms regulating Rider activity are largely unknown. We have developed a bioinformatics pipeline for the functional annotation of retrotransposons containing LTRs and defined all full-length Rider elements in the tomato genome. Subsequently, we showed that accumulation of Rider transcripts and transposition intermediates in the form of extrachromosomal DNA is triggered by drought stress and relies on abscisic acid signalling. We provide evidence that residual activity of Rider is controlled by epigenetic mechanisms involving siRNAs and the RNA-dependent DNA methylation pathway. Finally, we demonstrate the broad distribution of Rider-like elements in other plant species, including crops. Our work identifies Rider as an environment-responsive element and a potential source of genetic and epigenetic variation in plants.

Details

Original languageEnglish
Article numbere1008370
Pages (from-to)1-28
Number of pages28
JournalPLoS Genetics
Volume15
Issue number9
Publication statusPublished - 16 Sep 2019